Circle Theorem: Angles at the centre

Autor:Luke

By moving the point C and D around, what do you notice about each of the angles? What stays the same and what changes? Then, what do we notice about the angle at the centre and one at the circumference?

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A
There are always 2 equal angles in a triangle in the circle
B
The angle at the centre of a circle is equal to the sum of 2 angles in the triangle
C
The angle at the centre is twice the angle at the circumference
D
The angle at the circumference E is always acute

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